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KANGAROO-RATS                                     1 3 7

has a single, not bifid, cul-de-sac, is sacculated by two principal
bands and other subsidiary ones. Its internal structure has
already been to some extent described. The spleen of J2. bennetti
is remarkable for the fact that it is not T-shaped, whereas
JD. inustus agrees with other Macropodines in the form of this
organ. The small intestine of D. bennetti is 95 inches long, the
large 38. The caecum appears to differ in the two species; it
is smaller in D. bennetti, where it is only 2 inches in length.
The most remarkable feature of the liver is the large size of the
left lateral lobe and the bilobed condition of the Spigelian lobe;
this at least was tha case with D. bennetti. A. recently-described
species l has been attentively studied in its native haunts by Dr.
Lumholtz.2 It lives in the highest parts of the mountainous
scrubs of Queensland, where it moves quickly on the ground as
well as among the trees. It is hunted with Dingos by the
" blacks," and is eaten by them.3
Isagostropfaus is a generic name that has been proposed by
Mr. Thomas for a small Wallaby 18 inches in length, which is
distinguished by the fact that the long claws of the hind-limbs
are entirely hidden by long and bristly hairs; the muffle is
naked; there is no canine. The bullae are swollen. There is but
one species of the genus, L. fasciatus, a native of "West
Sub-Fata. 2. Potoroinae.—Aepyprymnus and the other
genera placed in this sub-family are known by the vernacular
name of Hat-Kangaroos, or sometimes Kangaroo -Rats. The
latter term has been called "incorrect/* though it is just as
good as the former, both of them in fact being inaccurate as
implying some likeness to or relation with a Rat. The present
genus has a partially hairy rhinarium ; the auditory bullae are
not swollen. It contains but one species, JLe. rwfescens, a native
of Eastern Australia, which is distinguished by its very long
Bettongia has long hind-feet as in A.epypry minus, but the
rhinarium is entirely naked instead of being partially hairy,
while the ears are much shorter. The genus, which contains
four species, is remarkable as being the only ground-living
mammal with a prehensile tail, which it uses to carry grass, etc.
1 Proc. Zool. Soc. 1895, p. 131.                                2 JMd. 1884, p. 387.
3 Ibid. 1884, p. 407.